The term 'Mirror Hog' is a slang term used to describe someone who spends a lot of time preening in front of a mirror. The crossword solutions for this term are 'PREENER' (7 letters) and 'PREENED' (7 letters). Preening is the act of grooming oneself, such as combing one's hair or adjusting one's clothing. Therefore, the term 'Mirror Hog' can be used to describe someone who spends a lot of time grooming themselves in front of a mirror.